Once upon a time there was a piranha and a catfish. The piranha saw the catfish on skype. Piranha said, "Come to my house for lunch." The catfish went over to his house. The piranha was sharpening his teeth. "Hi my lunch," The piranha said. The catfish ran away and said, "I'm not your lunch!" Then the piranha went over and knocked on the door. Catfish trapped piranha. 
Don't trust strangers. 